Hello Kriti,

Officially there is no any defense quota reservation in Government Medical college and Hospital, Chandigarh. There are total 100 seats. You can check the distribution of the seat with the given below link on Page No. 18.

https://gmch.gov.in/admission/2018/MBBS/prospectus_2018.pdf

As per the official,  The condition of 12th passed schools/colleges recognized by the Chandigarh Administration is waived off in respect of wards of serving defense personnel/ex-servicemen.

Good Luck!